Hammon certainly might prefer the pro environment, especially since she's been in it for several years, if not longer--but there is nothing "top of the world" about the WNBA, IMO. The league loses money, the players are poorly paid, it has virtually no TV audience. Indeed, hasn't the NBA subsidized the WNBA since it started? The league wouldn't survive on its own.
Who besides Hammon would be an A+ hire? I can't think of anybody who'd be remotely viable except maybe Moore and Schaefer--and given their ages I'd rate them B and B+ at this stage of their careers.